https://doi.org/10.1140/epjd/e2002-00214-0
Resonance interaction between one excited and one ground state atom
Department of Applied Mathematics, Research School of Physical
Sciences and Engineering, Institute of Advanced Studies, Australian National University, Canberra, Australia 0200
Corresponding author: a mtb110@rsphysse.anu.edu.au
Received:
31
January
2002
Revised:
25
July
2002
Published online:
29
October
2002
The nature of the resonance interaction between two isotropic atoms in an excited configuration is reinvestigated. The currently accepted oscillatory form for the long-range retarded resonance interaction is shown to be a subtle artefact that arises due to too drastic approximations. Formulation of the resonance interaction energy problem in terms of the interacting system leads to a form that it is 
in the retarded limit. We also demonstrate that the resonance interaction energy at any finite temperature goes over to purely classical long-range asymptote. This manifestation of the correspondence principle is due to thermal excitation of the electromagnetic field. We finally discuss why the textbook result for the Förster energy transfer between two atoms is incorrect for the same reasons.
PACS: 34.20.Cf – Interatomic potentials and forces / 34.30.+h – Intramolecular energy transfer; intramolecular dynamics; dynamics of van der Waals molecules
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2003
